This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 16 |
| 6 | 37 |
| 7 | 95 |
| 8 | 238 |
| 9 | 624 |
| 10 | 1650 |
| 11 | 4478 |
| 12 | 12356 |
| 13 | 34756 |
| 14 | 99313 |
| 15 | 288145 |
| 16 | 847366 |
| 17 | 2523092 |
| 18 | 7597834 |
| 19 | 23117382 |
| 20 | 71007196 |